fix a typo in common-tips.md (#1658)

Fixed a typo in the first sentence of shallow mounting.
vuejs · Aug 21, 2020 · fadddc2 · fadddc2
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diff --git a/docs/guides/common-tips.md b/docs/guides/common-tips.md
@@ -14,7 +14,7 @@ This topic is discussed with more details in a [great presentation by Matt O'Con
 
 ### Shallow mounting
 
-Sometimes, mounting a whole component with all its all dependencies might become slow or cumbersome. For example, components that contain many child components.
+Sometimes, mounting a whole component with all its dependencies might become slow or cumbersome. For example, components that contain many child components.
 
 Vue Test Utils allows you to mount a component without rendering its child components (by stubbing them) with the [`shallowMount`](../api/#shallowmount) method.